Coordinate Converter – GPS & GIS Coordinate Transformer
Instantly convert coordinates across 31+ geodetic systems. Batch processing with full client-side privacy.
Coordinate Picker Tools
Get coordinates from popular mapping services like Google Maps, AMap, Baidu Maps, and Tencent Maps to use in our converter.
AMap Coordinate Picker
lbs.amap.com/tools/pickerBaidu Coordinate Picker
api.map.baidu.com/lbsapi/getpointTencent Coordinate Picker
lbs.qq.com/getPointGoogle Maps Coordinate Picker
google.com/mapsSupported Conversions
Convert coordinates between 31+ geodetic systems with professional-grade accuracy
NAD27 (North American Datum 1927) is a historic geodetic datum for the United States, Canada, and Mexico, based on the Clarke 1866 ellipsoid. It was the primary reference system for North American mapping for most of the 20th century.
NAD27 was established in 1927 by the U.S. Coast and Geodetic Survey, replacing numerous local datums. It used Meades Ranch in Kansas as its reference origin. NAD27 was gradually superseded by NAD83 starting in 1986.
NAD83 (North American Datum 1983) is the official geodetic reference system for the United States, Canada, Mexico, and Central America. It uses the GRS80 ellipsoid and is aligned with ITRF for North American plate stability.
NAD83 was established in 1986, replacing the older NAD27 datum. It has undergone multiple refinements (NAD83(1986), NAD83(NSRS2007), NAD83(2011)) to improve accuracy using GPS observations and the National Spatial Reference System (NSRS).
WGS84 (World Geodetic System 1984) is the global standard geodetic reference system used by GPS. It defines an Earth-centered, Earth-fixed coordinate system and geodetic datum.
Developed by the U.S. Department of Defense in 1984, WGS84 has undergone several refinements (WGS84(G730), WGS84(G873), WGS84(G1150), WGS84(G1762)) to improve accuracy through GPS satellite observations.
UTM (Universal Transverse Mercator) is a map projection system that divides the Earth into 60 zones, each 6 degrees of longitude wide.
The UTM system was developed by the U.S. Army Corps of Engineers in the 1940s and later adopted by NATO.
MGRS (Military Grid Reference System) is a global grid reference system based on UTM projections. It divides the Earth into 60 UTM zones and uses grid zone designators and 100km square identifiers for precise location referencing.
MGRS was developed by NATO during the Cold War era as a standardized military grid system for coordinating joint operations across member nations. It has since been adopted by humanitarian organizations, emergency services, and outdoor recreation.
GCJ-02 (Mars Coordinate System) is a geodetic datum used in China for geospatial data. It applies an encrypted offset to WGS84 coordinates to comply with national regulations.
Developed by the Chinese National Bureau of Surveying and Mapping, GCJ-02 was introduced to implement the national security policy on geospatial information. Most Chinese map services use this system.
BD-09 (Baidu Coordinate System) is a geodetic system developed by Baidu, based on GCJ-02 with additional encryption for use in Baidu Maps and related services.
Baidu developed BD-09 by applying a secondary encryption layer on top of GCJ-02 to further obfuscate coordinates. It is proprietary to Baidu and used exclusively in their mapping ecosystem.
CGCS2000 (China Geodetic Coordinate System 2000) is China's official national geodetic coordinate system, replacing Beijing 1954 and Xian 1980 systems. It is aligned with ITRF97.
CGCS2000 was officially adopted by the State Council of China in 2008 as the national standard.
BJ54 (Beijing 1954 Coordinate System) was China's first national geodetic coordinate system.
BJ54 was established in 1954 based on the Soviet Pulkovo 1942 datum.
BJ2000 is China's modern geodetic reference system based on CGCS2000, established to replace BJ54.
BJ2000 was developed alongside CGCS2000 as part of China's geodetic infrastructure modernization.
Xi'an 80 (Xian1980, Chinese Geodetic Datum 1980) is a Chinese national geodetic datum established in the 1980s. It uses the IAG75 ellipsoid (a=6378140m, 1/f=298.257) and employs a 7-parameter Helmert transformation from WGS84. It is widely used in Chinese surveying and mapping alongside BJ54 and CGCS2000.
Xi'an 80 was established in the 1980s as China's second national geodetic datum, replacing the earlier BJ54 system. It improved accuracy by using the IAG75 ellipsoid and a more precise geoid model, providing a unified reference for national mapping and infrastructure projects.
OSGB36 (Ordnance Survey Great Britain 1936) is the official geodetic datum for England, Scotland, Wales, and Northern Ireland. It uses the Airy 1830 ellipsoid and is the basis for all UK Ordnance Survey mapping.
OSGB36 was established in 1936 by the Ordnance Survey as a unified national datum replacing numerous local county datums. It forms the foundation of the British National Grid (BNG) projection system used across the UK.
ETRS89 is the EU-recommended geodetic reference system for Europe, fixed to the stable part of the Eurasian Plate.
ETRS89 was established in 1990 by the EUREF subcommission.
ED50 was the primary geodetic reference system for Western Europe during the mid-20th century.
ED50 was developed after World War II to unify the various national datums across Europe.
HTRS96 is Croatia's national geodetic reference system, based on ITRF96 and compatible with ETRS89.
HTRS96 was established in 1996 as Croatia's modern geodetic datum.
EOV is Hungary's national unified projection coordinate system, used for GIS, mapping, and cadastral surveys.
EOV was introduced in 1975 to replace earlier Hungarian coordinate systems.
CH1903+ (Swiss Geodetic Datum 1903+) is the official geodetic datum for Switzerland and Liechtenstein. It uses the Bessel 1841 ellipsoid with a 3-parameter shift (dx=674.4m, dy=15.1m, dz=405.3m) from WGS84. CH1903+ is an improved version of the original CH1903 datum, providing higher accuracy for surveying and mapping.
CH1903 was originally established in 1903 as the first unified Swiss coordinate system. CH1903+ was introduced later as a refined version with improved accuracy using the Bessel 1841 ellipsoid and modern geodetic measurements. It has been the foundation for Swiss national mapping and the LV95 coordinate system.
RGF93 (Reseau Geodesique Francais 1993) is the official geodetic datum for metropolitan France, aligned with ETRS89 and equivalent to WGS84. It uses the GRS80 ellipsoid and is the basis for the Lambert-93 projection system.
RGF93 was established in 1993 by IGN to replace the older NTF system. It aligns France with ETRS89, adopting the GRS80 ellipsoid for modern GPS-compatible surveying.
Lambert-93 (RGF93 / Lambert-93, EPSG:2154) is the official projected coordinate system for metropolitan France. It uses a Lambert Conformal Conic projection with two standard parallels (44°N and 49°N) to minimize distortion across the French territory. It is based on the RGF93 geodetic datum with the GRS80 ellipsoid.
Lambert-93 was established as part of the RGF93 system in the 1990s by IGN France to provide a unified national projection system, replacing the multiple local projection zones previously used. It became mandatory for all French public spatial data.
JGD2011 is Japan's national geodetic system, updated after the 2011 Great East Japan Earthquake to account for significant crustal deformation.
JGD2011 replaced JGD2000 following the massive crustal displacements caused by the 2011 Tohoku earthquake (Mw 9.0).
JGD2000 was Japan's national geodetic system before the 2011 earthquake, based on ITRF94 and the GRS80 ellipsoid.
JGD2000 replaced the Tokyo Datum in 2002, modernizing Japan's surveying infrastructure with GPS-compatible coordinates.
PRS92 (Philippine Reference System 1992) is the national geodetic coordinate system of the Philippines.
PRS92 was established in 1992 to replace the Luzon Datum 1911.
GDM2000 is Malaysia's national geodetic reference system, based on ITRF2000 and the GRS80 ellipsoid.
GDM2000 replaced the Malayan Datum 1948 to provide a modern, GPS-compatible reference system.
Indian 1975 is a geodetic datum primarily used in Thailand and Southeast Asian countries.
Indian 1975 was established as a regional datum for Southeast Asia.
KGD2002 (Korean Geodetic Datum 2002) is the official geodetic datum for South Korea, aligned with ITRF2000 at epoch 2002.0. It uses the GRS80 ellipsoid and is functionally equivalent to WGS84 for most applications.
KGD2002 was adopted in 2002, replacing the older Tokyo Datum that was historically used on the Korean peninsula. It provides a modern, GPS-compatible reference system aligned with the International Terrestrial Reference Frame.
Clarke 1880 is a historic geodetic ellipsoid defined by Alexander Ross Clarke in 1880.
The Clarke 1880 ellipsoid became the basis for many national datums in Africa, including Arc 1950.
SIRGAS2000 (Sistema de Referencia Geocéntrico para las Américas 2000) is the official geodetic datum for South America, aligned with ITRF2000 at epoch 2000.0. It uses the GRS80 ellipsoid and is functionally equivalent to WGS84 for most applications. It is the mandatory system in Brazil and widely adopted across the continent.
SIRGAS2000 was established in 2000 as the unified geodetic reference system for South America, replacing older local datums. It was developed through international collaboration and provides a continent-wide modern reference aligned with GPS/GNSS.
GDA2020 (Geocentric Datum of Australia 2020) is the current official geodetic datum for Australia, aligned with ITRF2014 at epoch 2020.0. It uses the GRS80 ellipsoid and provides sub-meter accuracy across the Australian continent.
GDA2020 was released by Geoscience Australia in 2017, replacing GDA94. It reflects the accumulated tectonic movement of the Australian plate (~1.5m since 1994) and aligns Australia's spatial data with modern GNSS positioning.
GDA94 (Geocentric Datum of Australia 1994) is the previous official geodetic datum for Australia, aligned with ITRF92 at epoch 1994.0. It uses the GRS80 ellipsoid and is functionally equivalent to WGS84 for most applications.
GDA94 was adopted in 2000 as Australia's first geocentric datum, replacing the AGD66/AGD84 (Australian Geodetic Datums). It provided a modern, GPS-compatible reference system for the continent.
NZGD2000 (New Zealand Geodetic Datum 2000) is the official geodetic datum for New Zealand, aligned with ITRF96 at epoch 2000.0. It uses the GRS80 ellipsoid and is functionally equivalent to WGS84 for most applications.
NZGD2000 was adopted in 2000, replacing the older NZGD49 datum. It provides a modern, GPS-compatible reference system that aligns with the International Terrestrial Reference Frame.
DMS (Degrees, Minutes, Seconds) is a sexagesimal coordinate format where angles are expressed in degrees (°), minutes ('), and seconds ("). It is the traditional format for paper maps and GPS devices.
The DMS format dates back to ancient Babylonian astronomy and was adopted by early European navigators and cartographers. It remained the standard for nautical charts and topographic maps until the widespread adoption of decimal degrees.
DDM (Degrees and Decimal Minutes) is a coordinate format combining whole degrees with minutes expressed as a decimal fraction, widely used in GPS receivers and marine navigation.
DDM emerged as a practical compromise between the traditional DMS format and modern decimal degrees, offering better precision than DMS while remaining compatible with analog chart plotting.
Decimal Degrees (DD) is a coordinate format where latitude and longitude are expressed as decimal fractions of degrees, the most widely used format in digital mapping and GIS software.
Decimal degrees became practical with the advent of digital computing and GPS technology, enabling direct mathematical calculations without the need for sexagesimal conversion.
BNG (British National Grid) is the official projected coordinate system for the United Kingdom, based on the OSGB36 geodetic datum and the Transverse Mercator projection optimized for the British Isles.
The British National Grid was developed by the Ordnance Survey as a unified national grid system, replacing various local projections. It uses a Transverse Mercator projection with a central meridian at 2°W, designed to minimize distortion across Great Britain.
Batch conversion with unlimited entries
Export results as XLSX files
100% client-side processing - your data stays private
34+ coordinate format support
The 7-parameter Helmert transformation (also known as time-tested similarity transformation) is a mathematical method used to convert coordinates between two different geodetic datums. It shifts, rotates, and scales the coordinate system in 3D space to align one datum with another. This is essential when converting between local historical datums (like BJ54, ED50, Xian80) and the global WGS84 system.
Different countries and regions developed their own geodetic datums using different ellipsoids and reference points. For example, China uses BJ54 (Krasovsky 1940 ellipsoid), Xian80 (IAG75 ellipsoid), and CGCS2000 (GRS80 ellipsoid). To convert coordinates between these systems and WGS84, we use 7-parameter Helmert transformation because the datums differ in origin (3 shifts), orientation (3 rotations), and scale (1 factor).
dx, dy, dz (meters) - shifts along X, Y, Z axes of the Earth-centered reference frame
rx, ry, rz (radians) - rotations around each axis to align datum orientations
s (ppm) - scale factor adjusting for size differences between ellipsoids
# Common 7-parameter example: ED50 → WGS84 (European area) dx=-87 dy=-96 dz=-120 rx=0 ry=0 rz=0 s=0 # BJ54 → WGS84 (China area, regional parameters may vary) dx=31.4 dy=144.3 dz=74.8 rx=0 ry=0 rz=0 s=0 # Note: Accurate parameters depend on your specific region. # Consult local surveying authorities for official values.
A sexagesimal notation where coordinates are expressed in degrees (°), minutes ('), and seconds ("). The traditional format used in paper maps and GPS devices.
Example: 23°3'3.78"N, 113°22'17.36"E
A coordinate format where degrees are followed by minutes expressed as a decimal fraction. Widely used in GPS receivers, NMEA sentences, USGS topo maps, and aviation charts. DDM combines human-readable degrees with precise decimal minutes.
Example: 40°26.7717'N, 79°58.9336'W
Degrees expressed as a single decimal fraction. The most widely used format in digital mapping and GIS software.
Example: 23.05105, 113.37149
A metric grid system used by the Ordnance Survey for all official UK mapping. Coordinates are expressed as easting and northing in meters, projected from OSGB36 using a Transverse Mercator projection.
Example: 530000 180000 (London area)
Official French Lambert Conformal Conic projection used by IGN for all national mapping. Coordinates are expressed in meters.
Example: 652000 6850000 (Paris area)